Confirm against a standalone 1969 first-edition scan of Perceptrons that 'credit-assignment' is absent from the original text (present only in the 1988 Epilogue)

Core question status: [unverified — could not confirm or deny after search] at the level the question demands (a direct 1969-vs-1988 text diff). No standalone, independently-readable full-text scan of the 1969 MIT Press first edition (as opposed to the 1988 Expanded Edition) was located this session despite a systematic search. What did surface is two new, independent Tier 2 sources — neither of which existed in the prior captures — that corroborate, from different angles, the existing Tier 1 finding in claim-perceptrons-credit-assignment-only-in-1988-epilogue that "credit-assignment" belongs to the 1988 added material rather than the 1969 body. This capture documents that corroboration and the residual gap plainly, per question-verify-perceptrons-1969-credit-assignment-absent.

Claim: No standalone scan of the 1969 first edition (independent of the 1988 Expanded Edition) could be located this session

Claim type: Historical/negative finding (a report of a search's non-result, not a positive assertion about book content). A direct Internet Archive catalog query for title:(Perceptrons) AND creator:(Minsky) returns exactly two items, both catalogued as the 1988 edition:

No 1969-dated item exists in Internet Archive's catalog under this search. A HathiTrust catalog search returned HTTP 403 this session (not resolved either way). Google Books lists only "about" pages (no full-text preview) for the 1969 printings (id=Ow1OAQAAIAAJ, among others). A Scribd upload titled "Minsky1969 – An Introduction to Computational Geometry" exists but the accessible preview is a 9-page fragment with no visible provenance confirming it is a genuine 1969-edition scan, and its full text is not accessible without a Scribd account — not used as evidence here.

Claim: Léon Bottou's 2017 foreword to the MIT Press reissue independently confirms the book's compositional structure — chapters 0–13 are the 1969 first-edition text; the Prologue and Epilogue are 1988 additions

Claim type: Historical/structural claim about the book's own construction. Escalated to the Tier 1–2 floor because it is load-bearing for the whole question (it is the mechanism by which "credit-assignment" could be 1988-only even though it appears somewhere in the single 1988-printed scan). This is an independent line of evidence from the page-count triangulation (292pp vs 258pp) used in the prior capture — Bottou states the structure directly rather than inferring it from page counts.

"This reissue contains the first edition text of Perceptrons, with fourteen chapters numbered 0 to 13. The accompanying Prologue and Epilogue were written for the 1988 expanded edition."

Note: this PDF (fetched via extract_pdf, 9 pages) is only Bottou's foreword, not the book body — it does not itself contain a searchable 1969 text to check for "credit-assignment." It corroborates structure, not content.

Claim: Jordan Pollack's contemporaneous 1989 peer-reviewed review quotes four passages verbatim from the 1969 arabic-paginated body — none contain "credit assignment" — while separately citing the credit/blame-apportionment argument to the roman-numeral-paginated 1988 Prologue

Claim type: Historical/textual placement claim, load-bearing, held to the Tier 1–2 floor. Clears it: Pollack's review is a named-academic, peer-reviewed (Journal of Mathematical Psychology, 1989) reading of the physical 1988 Expanded Edition shortly after publication, quoting it directly with page numbers.

Pollack quotes four passages from the book as examples of its "loaded terms," all cited to arabic page numbers consistent with the preserved-1969-pagination body (not the roman-numeral front matter):

"Perceptrons have been widely publicized as ''pattern recognition'' or ''learning'' machines... Most of this writing ... is without scientific value." (p. 4) "We do not see that any good can come of experiments which pay no attention to limiting factors..." (p. 18) "[We] became involved with a somewhat therapeutic compulsion..." (p. 20) "There is no reason to suppose that any of these virtues carry over to the many layered version. Nevertheless, we consider it to be an important research problem to elucidate (or reject) our intuitive judgement that the extension is sterile." (p. 231)

None of these four sampled passages contain "credit assignment." This is non-exhaustive spot-evidence (four cherry-picked passages, not a full-text scan), not proof of absence across the whole 258-page body — but it is a second, independent contemporaneous reader's direct engagement with the physical text, and it lines up with the existing Tier 1 finding.

Separately, and distinctly, Pollack cites Minsky & Papert's account of why perceptron research stalled — built around "the apportionment of credit (or blame) for incorrect global behavior of a system to specific elements in an interdependent system of such elements" — to page xiii, a roman-numeral page:

"...and Minsky and Papert assert that perceptrons "had no way to represent the knowledge required for solving certain problems." (p. xiii)"

Roman-numeral pagination in this book is used for the 1988 Prologue ("The View from 1988"), distinct from both the arabic-paginated 1969 body (pp. 1–258) and the arabic-paginated Epilogue material that continues after it (Pollack elsewhere cites Epilogue passages at pp. 247–262). This places Pollack's account of the credit-assignment argument in the Prologue specifically — a second, independent (different edition-reading, different year, different reviewer) data point that the credit-assignment framing lives in 1988-added material, not the 1969 arabic-paginated body. It also refines the prior capture's claim that the term is "only" in the Epilogue: the underlying argument appears to be introduced in the Prologue and elaborated with the literal phrase "credit-assignment" in the Epilogue — both are 1988 additions, so the core "absent from 1969" conclusion is unaffected, but "only in the Epilogue" may be too narrow a location claim.

Further leads

• Jordan Pollack's review independently cites the "intuitive judgment... sterile" passage at p. 231, not p. 232 — resolving (in favor of 231) an unconfirmed discrepancy flagged in the prior capture 10-inbox/raw/20260708-0200-does-perceptrons-1969-p.md; worth a dedicated correction pass on that note.
• The Scribd item "Minsky1969 – An Introduction to Computational Geometry" (https://www.scribd.com/document/608085966/Minsky1969-An-Introduction-to-Computational-Geometry) may or may not be a genuine 1969-edition scan; unresolved, requires an account to check further.
• HathiTrust's catalog returned HTTP 403 on both attempts this session; worth a retry with a different query path or a direct HathiTrust account.
• Internet Archive's two 1988-edition items (perceptronsintro0000mins, perceptronsintro00mins) remain access-restricted for full OCR/search-inside per the prior capture; an IA "Print Disabled" borrow account would let a researcher directly diff the arabic-paginated body (pp. 1–258) against the Prologue/Epilogue for every occurrence of "credit" — the most direct way to finally close this question.